1. Phylum Annelida 1

3. McDougall ch. 23 annelids video McDougall videos ch 14 symbitotic relationships

4. Annelids Annelids range in size from the Giant Earthworms, of which Michrochaetus rappi (Michrochaetus michrochaetus) is the largest average length of 1.36 m (54 ins) and a record breaking specimen has been recorded that measured 6.7 metres (22 ft) in length, it was 2cm (0.8 ins) in diametre. The smallest Annelid known to science is Chaetogaster annandalai full grown at 0.5 mm (0.02 ins).

5. Phylum Annelida From the Latin Annellus a “little ring”. Segmented body Metamere – segment in the body Setae Small hair-like structures Absent in leeches Coelom divided by septa Separating tissue 5

6. Closed circulatory system Have vessels and a pump Nephridia for each segment (metamere) Excretory structures Nervous system – ganglia = brain; lateral nerve cords Reproduction Most sexual Some hemaphrodites Phylum Annelida

7. Segmented Worms Body divided into repeating segments 7

8. Metamerism

9. Setae – help in movement

10. ALL SEGMENTED WORMS are EUCOELOMATES! “True coelom” SEGMENTED WORMS (PHYLUM: ANNELIDA) http://www.lander.edu/RSFOX/310images/310bilatImage.html 10

11. Septa Metamerism 11

12. Closed Circulatory System 12

13. Ventral vessel DorsalvesselDorsalvessel BladderBladder NephridioporeNephridiopore NephrostomeNephrostome Metanephridium – excretion of wastes 13

14. Fig. 17.14 14

15. 15 Nervous System

16. Earthworm Reproduction 16

17. Trochophore larva Apical tuft MouthMouth AnusAnus Ciliary band StomachStomach 17

18. Annelid development 18

19. SEGMENTED WORMS Annelida FREE LIVING PARASITIC Earthworms Leeches 19

20. Sedentary/Sessile – don’t move 20

21. Terrestrial Earthworm 21

22. Feed on Blood Leech 22

23. Class Polychaeta Many setae Parapodia = “paired feet” 23

24. 24

25. Class Polychaeta Head Parapodium Tentacle 25

26. JawJaw Everted pharynx EyeEye CirrusCirrus PalpPalp TentacleTentacle ParapodiumParapodium 26 Polychaete Worm Predatory

27. Nereis 27

28. Class Polychaeta Fireworm 28

29. Sedentary Polychaete Lugworm 29

30. 30

31. 31

32. Pelagic* Polychaete *Drift in the open ocean 32

33. Just Slinking or Wriggling in the Rain Have you ever noticed that after a spring rain, earthworms come out of the soil and appear on driveways, in puddles, and on sidewalks? Why does this happen? 1. An earthworm breathes through its skin. If its skin dries out, it cannot breathe. Why would an earthworm be more likely to “surface” during the rain than at other times? 2. What types of weather conditions might be fatal for an earthworm?

34. Class Oligochaeta Few setae Clitellum No parapodia Monoecious Both male and female parts 34

35. Lumbricus terrestris - earthworm Feed on decaying organic matter Enrich soil Exceedingly important in soil creation, particularly in temperate areas. Without them, agriculture and perhaps the whole of human society as we know it would never have evolved. 35

36. Return nutrients to soil by decomposing dead leaves and organic matter Burrowing allows air and water to penetrate to roots Tunnels loosen soil so roots can grow more easily Earthworms play an important role in soil fertility “intestines of the earth” -Aristotle 36

37. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. External Structures of an Earthworm 37

38. Section 27-3 Anus Clitellum Circular muscle Longitudinal muscle Nephridia Ganglia Ring vessels Reproductive organs Ventral blood vessel Ganglion Brain Mouth Dorsal blood vessel Crop Gizzard Body segments Setae The Anatomy of an Earthworm

39. 39

40. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Internal Structures of an Earthworm 40

41. Body wall EpitheliumEpithelium Circular muscle Longitudinal muscle 41

42. Worms Worms2

43. Class Hirudinea Anterior & posterior sucker No setae Most live in fresh water Feed Invertebrates Body fluids Blood 43

44. 44

45. PARASITIC SEGMENTED WORMS LEECHES Medical uses 45

46. Man vs. Wild - Leeches

47. Annelid Annelid 3 Annelid 4

48. Dirty Jobs – Bloodworms http://www.youtube.com/watch?v=FX8DQ436F4g Dirty Jobs worm grunting part 1 http://videos.howstuffworks.com/discovery/38849- dirty-jobs-shorts-an-introduction-to-worm-grunting- video.htmhttp://videos.howstuffworks.com/discovery/38849- dirty-jobs-shorts-an-introduction-to-worm-grunting- video.htm Worm grunting part 2 http://www.yourdiscovery.com/video/dirty-jobs- worm-grunting/http://www.yourdiscovery.com/video/dirty-jobs- worm-grunting/ Earth watch – worm grunting http://www.youtube.com/watch?v=D0YjFT8F7RU